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Integer literal overflows in match patterns result in unhelpful error message #94239
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A-diagnostics
Area: Messages for errors, warnings, and lints
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
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ArcaneNibble
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A-diagnostics
Area: Messages for errors, warnings, and lints
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
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Feb 22, 2022
matthiaskrgr
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Feb 26, 2022
Fix show error message when literal overflows in match patterns Fix rust-lang#94239 This changes overflow behavior in [fn lit_to_const](https://github.com/rust-lang/rust/blob/master/compiler/rustc_mir_build/src/thir/constant.rs#L10)
Dylan-DPC
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Feb 27, 2022
Fix show error message when literal overflows in match patterns Fix rust-lang#94239 This changes overflow behavior in [fn lit_to_const](https://github.com/rust-lang/rust/blob/master/compiler/rustc_mir_build/src/thir/constant.rs#L10)
matthiaskrgr
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Feb 27, 2022
Fix show error message when literal overflows in match patterns Fix rust-lang#94239 This changes overflow behavior in [fn lit_to_const](https://github.com/rust-lang/rust/blob/master/compiler/rustc_mir_build/src/thir/constant.rs#L10)
This has since been partially fixed: the error message is correct for unsigned ints, but not signed ints, e.g. (playground link). fn main() {
match 0i8 {
0..=150 => {}
_ => {}
}
} @rustbot claim |
github-actions bot
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Oct 12, 2023
Fix overflow checking in range patterns When a range pattern contains an overflowing literal, if we're not careful we might not notice the overflow and use the wrapped value. This makes for confusing error messages because linting against overflowing literals is only done in a later pass. So when a range is invalid we check for overflows to provide a better error. This check didn't use to handle negative types; this PR fixes that. First commit adds tests, second cleans up without changing behavior, third does the fix. EDIT: while I was at it, I fixed a small annoyance about the span of the overflow lint on negated literals. Fixes rust-lang/rust#94239
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Labels
A-diagnostics
Area: Messages for errors, warnings, and lints
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Given the following code:
The current output is:
Ideally the output should look like:
The text was updated successfully, but these errors were encountered: